怎么定义雅思作文的好坏呢?

　　2. 完整性

　　正象我们前面说得那样，一个段落的主题思想靠推展句来实现，如果只有主题句而没有推展句来进一步交待和充实，就不能构成一个完整的段落。同样，虽然有推展句，但主题思想没有得到相对圆满的交待，给读者一种意犹未尽的感觉。这样的段落也不能完成其交际功能。例如：

　　Physical work can be a useful form of therapy for a mind in turmoil.Workconcentrates your thoughts on a concrete task. Besides, it is more usefultowork ---- you produce something rather than more anxiety or depression.

　　本段的主题句是段首句。本段的两个推展句均不能回答主题句中提出的问题。什么是 "a mind inturmoil"(心境不平静)Physicalwork又怎样能改变这种情况?为什么它能起therapy的作用?读者得不到明确的答案。

　　段首句所表达的主题思想是一种看法，必须有具体事例加以验证。上述两个推展句只是在文字上对主题作些解释，整个段落内容空洞，简而不明。如果用一两个具体的例子的话，就可以把主题解释清楚了。比如下段：

　　It is not always true that a picture is worth a thousand words.Sometimes,pictures are pretty useless things. If you can't swim and fall in theriver andstart gulping water, will you be better off to hold up a picture ofyourselfdrowning, or start screaming "Help"?

　　3.连贯性(coherence)

　　连贯性包括意连和形连两个方面，前者指的是内在的逻辑性，后者指的是使用转换词语。当然这两者常常是不可分割的。只有形连而没有意连，句子之间就没有内在的有机的联系;反之，只有意连而没有形连，有时行文就不够流畅。

　　1) 意连

　　段落中句子的排列应遵循一定的次序，不能想到什么就写什么。如果在下笔之前没有构思，边写边想，写写停停，那就写不出一气呵成的好文章来。下面介绍几种常见的排列方式。

　　A.按时间先后排列(chronological arrangement)

　　We had a number of close calls that day. When we rose, it was obviouslylateand we had to hurry so as not to miss breakfast; we knew the dining roomstaffwas strict about closing at nine o'clock. Then, when we had been drivingin thedesert for nearly two hours ----- it must have been close to noon ----the heatnearly hid us in; the radiator boiled over and we had to use most ofour drinkingwater to cool it down. By the time we reached the mountain, it wasfour o'clockand we were exhausted. Here, judgement ran out of us and we startedthe toughclimb to the summit, not realizing that darkness came suddenly in thedesert.Sure enough, by six we were struggling and Andrew very nearly went downa steepcliff, dragging Mohammed and me along with him. By nine, when the windhowledacross the flat ledge of the summit, we knew as we shivered together forwarmththat it had not been our lucky day.

　　本段从 "rose"(起床)写起，然后是吃早餐("not to miss breakfast", "closing atnineo'clock")，然后是 "close to noon"，一直写到这一天结束("By nine--")。

　　B. 按位置远近排列(spatial arrangement)。例如：

　　From a distance, it looked like a skinny tube, but as we got closer,wecould see it flesh out before our eyes. It was tubular, all right, butfatterthan we could see from far away. Furthermore, we were also astonished tonoticethat the building was really in two parts: a pagoda sitting on top of atubularone-story structure. Standing ten feet away, we could marvel at how muchof thepagoda was made up of glass windows. Almost everything under thewonderfulChinese roof was made of glass, unlike the tube that it was sitting on,whichonly had four. Inside, the tube was gloomy, because of the lack of light.Then asteep, narrow staircase took us up inside the pagoda and the lightchangeddramatically. All those windows let in a flood of sunshine and we couldsee outfor miles across the flat land.

　　本段的写法是由远及近，从远处("from a distance")写起，然后"get closer"，再到(" ten feetaway")，最后是"inside the pagoda"……当然，按位置远近来写不等于都是由远及 近。根据需要，也可以由近及远，由表及里等等。